IV needles

What are IV needles?

IV needles (medically a peripheral venous catheter, sold as Venflon or Angiocath) are hollow steel needles with a thin plastic tube around them. The steel makes the opening and then comes back out. What stays behind is the cannula: a soft plastic sleeve that moves with the skin. That one difference, flexible instead of rigid, is what the scene picks this type for.

How an IV needle works

The needle is a guide, not a destination. The description of the peripheral venous catheter puts it plainly: the steel serves only to bring the cannula in and is then withdrawn, after which the plastic tube stays in place. The technique has been around since 1945; the first disposable version came to market in 1964, and since 1983 they’ve been made of polyurethane.

For play, that order matters more than it sounds. As long as steel is in someone, every movement is a risk: turning, standing up, or flinching sends a rigid point sliding through tissue. A cannula bends with it. Anyone who wants to leave something in the skin for more than a couple of minutes picks this for that reason.

One thing belongs with this right away. In the clinic an IV needle goes into a vein, and that is exactly what does not happen in play. In needle play the needle goes shallowly through a fold of skin and nothing more. Puncturing a vein is a medical procedure, and running something into it is another. Neither belongs in a scene, no matter how tempting the image.

Which gauges there are

The size is given in gauge, and that scale runs backwards: the higher the number, the thinner the needle. The color is handier still. Each size has a fixed one, so you can tell from the cap what you’re holding without opening the packaging.

That table comes from the anesthesia literature and is the same in hospitals worldwide. Note the jump at the bottom: between yellow and orange there’s more than a factor of four in diameter. Orange and gray are made to run half a liter into someone within a minute. They’re here only so you recognize them and leave them alone.

What’s left for play is the thin end of the scale. Blue and yellow prick noticeably softer than green, and the difference between 22G and 18G feels on the skin like a different instrument, not one size up.

How to play sterile

With needles, working sterile isn’t the preparation for the play. It is the play, because it’s the one part where a mistake can’t be undone.

The WHO guideline for injections and related procedures lays out the steps, and they work just as well outside a clinic.

1. Hands first. Wash visibly dirty hands with soap under running water, rub clean hands with alcohol. Gloves only after that, not before.
2. Disinfect the skin with 60 to 70 percent alcohol, isopropyl or ethanol, on a single-use cotton pad. Methanol is not suitable for use on people.
3. Wipe from the inside out, starting from where the needle goes in, and not twice over the same spot. Let it work for thirty seconds and then dry fully. Wet skin isn’t disinfected.
4. Touch nothing more that you’ve just cleaned. Not even a quick press to feel where you were.
5. Never leave cotton wool sitting in a jar of alcohol. The guideline says so outright: a stash like that gets heavily contaminated with bacteria from hands and surroundings.
6. One needle, one skin, one time. Never a needle that has already been in someone else, and never the same needle twice.
7. Sharps container within reach, and into it right after use, where you stood. Don’t bend it, don’t break it off, don’t put the cap back on. If you must, scoop one-handed, never with two. Replace the container when it’s three-quarters full.

When you remove it there’s one extra check that’s specific to this type. Look whether the cannula comes out intact. There’s a rare complication where a piece of plastic breaks off and stays behind, and the only moment you’ll notice it is now.

The complications that come with this material are no secret otherwise: infection, phlebitis, bleeding under the skin, and a bruise. The first is the reason everything above exists.

What I see myself

I’m Victor, a gigolo, twenty-five years active in BDSM and trained as a psychotherapist. Needles are on my list with a note beside them, and that’s not for nothing.

People almost always ask the wrong question. They ask how deep it goes. Almost never do they ask how the material comes out of the packaging, which is where the one thing that can really go wrong sits. A prick is a prick. An infection runs on for two weeks.

The rest is pace. I explain everything before anything gets opened, and I say beforehand how many there will be. Whoever wants to stop halfway stops halfway, and then the session is a success, not a failure.

What you can do yourself

• Buy for the occasion, not in bulk. A box of blue is enough to know whether this is something for you.
• Sort out the container before you buy the needle. No disposal, no needles. The pharmacy has them.
• Ask about hepatitis B. There’s a vaccine for it, and that’s the cheapest precaution there is.
• Agree on who stops. With needles the person lying down is often the last to notice.

Where this fits on this site

Needles are on my list of options, marked as a prickly subject. How a scene like that gets built and what we go through beforehand is on the page about the BDSM date.

Sources

• Peripheral venous catheter. English Wikipedia, accessed 11 August 2026. Provides the working principle, where the needle serves only to introduce the cannula and is then withdrawn while the plastic tube stays in place, the sizing in Birmingham gauge with the diameter inversely proportional to the number, and the table of gauge, diameter in millimeters, and matching color (26G black to 14G orange), which the article draws from Edward Doyle, Paediatric Anaesthesia (OUP Oxford, 2007), page 110. It also provides the complications infection, phlebitis, extravasation, bleeding, and hematoma, the rare catheter embolism with the advice to check the tip for wholeness on removal, and the history: the technique from 1945, the first disposable version in 1964, and polyurethane from 1983.
• WHO Best Practices for Injections and Related Procedures Toolkit. World Health Organization, 2010, chapter 2, accessed via NCBI Bookshelf. Provides the hand hygiene with soap and running water for visibly dirty hands or alcohol for clean hands, the skin disinfection with a solution of 60 to 70 percent isopropyl alcohol or ethanol on a single-use cotton pad with the explicit warning against methanol, the wiping direction from the center outward without going over the same spot, the thirty seconds to work and full drying, the ban on pre-soaked cotton in a jar because it gets heavily contaminated with bacteria from hands and surroundings, the rule that a syringe is never reused, and the guidelines for sharps: don’t bend, break, or manipulate, avoid recapping or else scoop one-handed, discard right after use at the point of use in a sturdy leak- and puncture-resistant container within reach, and replace it when three-quarters full.

Related terms

• Glossary. IV needles are a tool; what you do with them is under needle play and play piercing in the same list.
• Injection needles. The variant without a cannula, with the RIVM’s risk classification for needlestick accidents attached.
• Needle play. What you do with these needles, and what you agree on beforehand.
• Play piercing. The same practice under the name that stresses the piercing, with the fainting risk attached.
• Bloodplay. The category needle play falls under.
• Moxa. The other instrument that moved from medicine to the playroom, with heat instead of a point.
• Edgeplay and abrasion are the other close neighbors.